# Solve question no. 4 of page no. 84 from the chapter "Average" of textbook "Shaping Maths AB 5B Part I - Solutions".

3 $×$ 10 years = 30 years

The total age of Ali, Ben and Chandra is 30 years.

 3 units = 30 years $-$ 6 years $-$ 9 years = 15 years

 1 unit = 15 years $÷$ 3 = 5 years

Chandra is 5 years old.

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